HVAC units are identified by their multiple-character model number that identifies a particular type of unit. How are carrier HVAC unit model numbers identified?ĬARRIER® BRAND HVAC UNITS. The first two or three letters in the serial number will indicate the month and year of manufacture. The Serial Number can be found on the furnace section of the heater on the Unit Rating Plate. Most Reznor HVAC Equipment built since 1949 has received an individual Serial Number. There may be a date stamp to the right of the serial number.

The second and third letters represent the year the fourth and fifth numbers represent the week. The serial number is a letter followed by a nine-digit number. How do I read my day and night serial number? Divide the number by 12 (which represents 12,000 Btu/hr, or one ton of cooling capacity) to get your AC unit’s tonnage. The possibilities on residential units range from 18 to 60. Within this string of letters and numerals, you should find an even, two-digit number. How do you tell the tonnage of a carrier model number?įind the model number. The second set of digits are the year of manufacture. The first two digits are the week of manufacturer. In the above style, the determining factor is having a letter in the middle of the serial number. The most common way to to determine the carrier ac age is through the serial number. How do I read my carrier HVAC serial number?

Carrier serial number identification